diff --git a/CleanSpec.mk b/CleanSpec.mk
index f5f2a14..7e5dae2 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -619,6 +619,8 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/etc/init/android.frameworks.bufferhub@1.0-service.rc)
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/super.img)
+
+$(call add-clean-step, find $(PRODUCT_OUT) -type f -name "generated_*_image_info.txt" -print0 | xargs -0 rm -f)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/Makefile b/core/Makefile
index 425bfcc..680fa13 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2237,7 +2237,6 @@
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       build/make/tools/releasetools/build_image.py \
       $(TARGET_OUT) $(systemimage_intermediates)/system_image_info.txt $(1) $(TARGET_OUT) \
-      $(systemimage_intermediates)/generated_system_image_info.txt \
       || ( mkdir -p $${DIST_DIR}; cp $(INSTALLED_FILES_FILE) $${DIST_DIR}/installed-files-rescued.txt; \
            exit 1 )
 endef
@@ -2285,22 +2284,7 @@
 $(INSTALLED_SYSTEMIMAGE_TARGET): $(BUILT_SYSTEMIMAGE) $(RECOVERY_FROM_BOOT_PATCH)
 	@echo "Install system fs image: $@"
 	$(copy-file-to-target)
-ifdef RECOVERY_FROM_BOOT_PATCH
-ifeq ($(PRODUCT_USE_DYNAMIC_PARTITION_SIZE),true)
-ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_SIZE),)
-	# system image size is dynamic, hence system_size in generated_system_image_info.txt does not
-	# have room for recovery from boot patch. Increase system_size so that check-all-partition-sizes
-	# accounts for the size of the patch.
-	sed -i'.bak' -e 's/^system_size=.*$$/system_size='"$$(( \
-	      $(call read-image-prop-dictionary,$(systemimage_intermediates)/generated_system_image_info.txt,system_size) + \
-	      $$($(call get-file-size,$(RECOVERY_FROM_BOOT_PATCH))) ))"'/' \
-	    $(systemimage_intermediates)/generated_system_image_info.txt
-endif
-endif
-endif
-	$(hide) $(call assert-max-image-size,$@ $(RECOVERY_FROM_BOOT_PATCH),\
-	    $(call read-image-prop-dictionary,\
-	        $(systemimage_intermediates)/generated_system_image_info.txt,system_size))
+	$(hide) $(call assert-max-image-size,$@ $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
 
 systemimage: $(INSTALLED_SYSTEMIMAGE_TARGET)
 
@@ -2309,9 +2293,7 @@
 	            | $(INTERNAL_USERIMAGES_DEPS)
 	@echo "make $@: ignoring dependencies"
 	$(call build-systemimage-target,$(INSTALLED_SYSTEMIMAGE_TARGET))
-	$(hide) $(call assert-max-image-size,$(INSTALLED_SYSTEMIMAGE_TARGET),\
-	    $(call read-image-prop-dictionary,\
-	        $(systemimage_intermediates)/generated_system_image_info.txt,system_size))
+	$(hide) $(call assert-max-image-size,$(INSTALLED_SYSTEMIMAGE_TARGET),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
 
 ifneq (,$(filter systemimage-nodeps snod, $(MAKECMDGOALS)))
 ifeq (true,$(WITH_DEXPREOPT))
@@ -2677,11 +2659,8 @@
   $(call generate-image-prop-dictionary, $(systemotherimage_intermediates)/system_other_image_info.txt,system,skip_fsck=true)
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       build/make/tools/releasetools/build_image.py \
-      $(TARGET_OUT_SYSTEM_OTHER) $(systemotherimage_intermediates)/system_other_image_info.txt $(INSTALLED_SYSTEMOTHERIMAGE_TARGET) $(TARGET_OUT)\
-      $(systemotherimage_intermediates)/generated_system_other_image_info.txt
-  $(hide) $(call assert-max-image-size,$(INSTALLED_SYSTEMOTHERIMAGE_TARGET),\
-    $(call read-image-prop-dictionary,\
-      $(systemotherimage_intermediates)/generated_system_other_image_info.txt,system_other_size))
+      $(TARGET_OUT_SYSTEM_OTHER) $(systemotherimage_intermediates)/system_other_image_info.txt $(INSTALLED_SYSTEMOTHERIMAGE_TARGET) $(TARGET_OUT)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_SYSTEMOTHERIMAGE_TARGET),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -2820,11 +2799,8 @@
     $(call build-image-kernel-modules,$(BOARD_VENDOR_KERNEL_MODULES),$(TARGET_OUT_VENDOR),vendor/,$(call intermediates-dir-for,PACKAGING,depmod_vendor)))
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       build/make/tools/releasetools/build_image.py \
-      $(TARGET_OUT_VENDOR) $(vendorimage_intermediates)/vendor_image_info.txt $(INSTALLED_VENDORIMAGE_TARGET) $(TARGET_OUT) \
-      $(vendorimage_intermediates)/generated_vendor_image_info.txt
-  $(hide) $(call assert-max-image-size,$(INSTALLED_VENDORIMAGE_TARGET),\
-      $(call read-image-prop-dictionary,\
-          $(vendorimage_intermediates)/generated_vendor_image_info.txt,vendor_size))
+      $(TARGET_OUT_VENDOR) $(vendorimage_intermediates)/vendor_image_info.txt $(INSTALLED_VENDORIMAGE_TARGET) $(TARGET_OUT)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_VENDORIMAGE_TARGET),$(BOARD_VENDORIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -2878,11 +2854,8 @@
   $(call generate-image-prop-dictionary, $(productimage_intermediates)/product_image_info.txt,product,skip_fsck=true)
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       ./build/tools/releasetools/build_image.py \
-      $(TARGET_OUT_PRODUCT) $(productimage_intermediates)/product_image_info.txt $(INSTALLED_PRODUCTIMAGE_TARGET) $(TARGET_OUT) \
-      $(productimage_intermediates)/generated_product_image_info.txt
-  $(hide) $(call assert-max-image-size,$(INSTALLED_PRODUCTIMAGE_TARGET),\
-      $(call read-image-prop-dictionary,\
-          $(productimage_intermediates)/generated_product_image_info.txt,product_size))
+      $(TARGET_OUT_PRODUCT) $(productimage_intermediates)/product_image_info.txt $(INSTALLED_PRODUCTIMAGE_TARGET) $(TARGET_OUT)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_PRODUCTIMAGE_TARGET),$(BOARD_PRODUCTIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -2933,11 +2906,8 @@
   $(call generate-image-prop-dictionary, $(product_servicesimage_intermediates)/product_services_image_info.txt,product_services, skip_fsck=true)
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       ./build/tools/releasetools/build_image.py \
-      $(TARGET_OUT_PRODUCT_SERVICES) $(product_servicesimage_intermediates)/product_services_image_info.txt $(INSTALLED_PRODUCT_SERVICESIMAGE_TARGET) $(TARGET_OUT) \
-      $(product_servicesimage_intermediates)/generated_product_services_image_info.txt
-  $(hide) $(call assert-max-image-size,$(INSTALLED_PRODUCT_SERVICESIMAGE_TARGET),\
-      $(call read-image-prop-dictionary,\
-          $(product_servicesimage_intermediates)/generated_product_services_image_info.txt,product_services_size))
+      $(TARGET_OUT_PRODUCT_SERVICES) $(product_servicesimage_intermediates)/product_services_image_info.txt $(INSTALLED_PRODUCT_SERVICESIMAGE_TARGET) $(TARGET_OUT)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_PRODUCT_SERVICESIMAGE_TARGET),$(BOARD_PRODUCT_SERVICESIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -2989,11 +2959,8 @@
     $(call build-image-kernel-modules,$(BOARD_ODM_KERNEL_MODULES),$(TARGET_OUT_ODM),odm/,$(call intermediates-dir-for,PACKAGING,depmod_odm)))
   $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
       ./build/tools/releasetools/build_image.py \
-      $(TARGET_OUT_ODM) $(odmimage_intermediates)/odm_image_info.txt $(INSTALLED_ODMIMAGE_TARGET) $(TARGET_OUT) \
-	  $(odmimage_intermediates)/generated_odm_image_info.txt
-  $(hide) $(call assert-max-image-size,$(INSTALLED_ODMIMAGE_TARGET),\
-      $(call read-image-prop-dictionary,\
-          $(odmimage_intermediates)/generated_odm_image_info.txt,odm_size))
+      $(TARGET_OUT_ODM) $(odmimage_intermediates)/odm_image_info.txt $(INSTALLED_ODMIMAGE_TARGET) $(TARGET_OUT)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_ODMIMAGE_TARGET),$(BOARD_ODMIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -3363,7 +3330,8 @@
 # (1): list of items like "system", "vendor", "product", "product_services"
 # return: map each item into a command ( wrapped in $$() ) that reads the size
 define read-size-of-partitions
-$(foreach p,$(1),$(call read-image-prop-dictionary,$($(p)image_intermediates)/generated_$(p)_image_info.txt,$(p)_size))
+$(foreach image,$(call images-for-partitions,$(1)),$$( \
+    build/make/tools/releasetools/sparse_img.py --get_partition_size $(image)))
 endef
 
 # round result to BOARD_SUPER_PARTITION_ALIGNMENT
@@ -3387,7 +3355,9 @@
 .PHONY: check-all-partition-sizes check-all-partition-sizes-nodeps
 
 # Add image dependencies so that generated_*_image_info.txt are written before checking.
-check-all-partition-sizes: $(call images-for-partitions,$(BOARD_SUPER_PARTITION_PARTITION_LIST))
+check-all-partition-sizes: \
+    build/make/tools/releasetools/sparse_img.py \
+    $(call images-for-partitions,$(BOARD_SUPER_PARTITION_PARTITION_LIST))
 
 ifeq ($(PRODUCT_RETROFIT_DYNAMIC_PARTITIONS),true)
 # Check sum(super partition block devices) == super partition
diff --git a/core/base_rules.mk b/core/base_rules.mk
index d5055d4..94aa1e4 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -760,6 +760,18 @@
 ## Register with ALL_MODULES
 ###########################################################
 
+ifeq ($(filter $(my_register_name),$(ALL_MODULES)),)
+    # These keys are no longer used, they've been replaced by keys that specify
+    # target/host/host_cross (REQUIRED_FROM_TARGET / REQUIRED_FROM_HOST) and similar.
+    #
+    # Marking them obsolete to ensure that anyone using these internal variables looks for
+    # alternates.
+    $(KATI_obsolete_var ALL_MODULES.$(my_register_name).REQUIRED)
+    $(KATI_obsolete_var ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED)
+    $(KATI_obsolete_var ALL_MODULES.$(my_register_name).HOST_REQUIRED)
+    $(KATI_obsolete_var ALL_MODULES.$(my_register_name).TARGET_REQUIRED)
+endif
+
 ALL_MODULES += $(my_register_name)
 
 # Don't use += on subvars, or else they'll end up being
@@ -820,17 +832,42 @@
   endif
 endif
 
-ALL_MODULES.$(my_register_name).REQUIRED := \
-    $(strip $(ALL_MODULES.$(my_register_name).REQUIRED) $(my_required_modules))
-ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED := \
-    $(strip $(ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED)\
-        $(my_required_modules))
-ALL_MODULES.$(my_register_name).TARGET_REQUIRED := \
-    $(strip $(ALL_MODULES.$(my_register_name).TARGET_REQUIRED)\
-        $(LOCAL_TARGET_REQUIRED_MODULES))
-ALL_MODULES.$(my_register_name).HOST_REQUIRED := \
-    $(strip $(ALL_MODULES.$(my_register_name).HOST_REQUIRED)\
-        $(LOCAL_HOST_REQUIRED_MODULES))
+ifdef LOCAL_IS_HOST_MODULE
+    ifneq ($(my_host_cross),true)
+        ALL_MODULES.$(my_register_name).REQUIRED_FROM_HOST := \
+            $(strip $(ALL_MODULES.$(my_register_name).REQUIRED_FROM_HOST) $(my_required_modules))
+        ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_HOST := \
+            $(strip $(ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_HOST)\
+                $(my_required_modules))
+        ALL_MODULES.$(my_register_name).TARGET_REQUIRED_FROM_HOST := \
+            $(strip $(ALL_MODULES.$(my_register_name).TARGET_REQUIRED_FROM_HOST)\
+                $(LOCAL_TARGET_REQUIRED_MODULES))
+    else
+        ALL_MODULES.$(my_register_name).REQUIRED_FROM_HOST_CROSS := \
+            $(strip $(ALL_MODULES.$(my_register_name).REQUIRED_FROM_HOST_CROSS) $(my_required_modules))
+        ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_HOST_CROSS := \
+            $(strip $(ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_HOST_CROSS)\
+                $(my_required_modules))
+        ifdef LOCAL_TARGET_REQUIRED_MODULES
+            $(call pretty-error,LOCAL_TARGET_REQUIRED_MODULES may not be used from host_cross modules)
+        endif
+    endif
+    ifdef LOCAL_HOST_REQUIRED_MODULES
+        $(call pretty-error,LOCAL_HOST_REQUIRED_MODULES may not be used from host modules. Use LOCAL_REQUIRED_MODULES instead)
+    endif
+else
+    ALL_MODULES.$(my_register_name).REQUIRED_FROM_TARGET := \
+        $(strip $(ALL_MODULES.$(my_register_name).REQUIRED_FROM_TARGET) $(my_required_modules))
+    ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_TARGET := \
+        $(strip $(ALL_MODULES.$(my_register_name).EXPLICITLY_REQUIRED_FROM_TARGET)\
+            $(my_required_modules))
+    ALL_MODULES.$(my_register_name).HOST_REQUIRED_FROM_TARGET := \
+        $(strip $(ALL_MODULES.$(my_register_name).HOST_REQUIRED_FROM_TARGET)\
+            $(LOCAL_HOST_REQUIRED_MODULES))
+    ifdef LOCAL_TARGET_REQUIRED_MODULES
+        $(call pretty-error,LOCAL_TARGET_REQUIRED_MODULES may not be used from target modules. Use LOCAL_REQUIRED_MODULES instead)
+    endif
+endif
 ALL_MODULES.$(my_register_name).EVENT_LOG_TAGS := \
     $(ALL_MODULES.$(my_register_name).EVENT_LOG_TAGS) $(event_log_tags)
 ALL_MODULES.$(my_register_name).MAKEFILE := \
diff --git a/core/build_id.mk b/core/build_id.mk
index 2f9c3f3..2329288 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=MASTER
+BUILD_ID=QT
diff --git a/core/definitions.mk b/core/definitions.mk
index 205a055..59aeb16 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -3334,7 +3334,7 @@
   $(eval enforce_rro_source_overlays := $(subst :, ,$(word 5,$(_o)))) \
   $(eval enforce_rro_partition := $(word 6,$(_o))) \
   $(eval include $(BUILD_SYSTEM)/generate_enforce_rro.mk) \
-  $(eval ALL_MODULES.$$(enforce_rro_source_module).REQUIRED += $$(LOCAL_PACKAGE_NAME)) \
+  $(eval ALL_MODULES.$$(enforce_rro_source_module).REQUIRED_FROM_TARGET += $$(LOCAL_PACKAGE_NAME)) \
 )
 endef
 
diff --git a/core/main.mk b/core/main.mk
index 25dd24b..3ff2fcd 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -595,12 +595,10 @@
 # Otherwise if the module is an executable or shared library,
 #   the required modules must be 64-bit;
 #   otherwise we require both 64-bit and 32-bit variant, if one exists.
-define select-bitness-of-required-modules
+define target-select-bitness-of-required-modules
 $(foreach m,$(ALL_MODULES),\
-  $(eval r := $(ALL_MODULES.$(m).REQUIRED))\
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_TARGET))\
   $(if $(r),\
-    $(if $(ALL_MODULES.$(m).FOR_HOST_CROSS),\
-      $(eval r := $(addprefix host_cross_,$(r))))\
     $(if $(ALL_MODULES.$(m).FOR_2ND_ARCH),\
       $(eval r_r := $(call get-32-bit-modules-if-we-can,$(r))),\
       $(if $(filter EXECUTABLES SHARED_LIBRARIES NATIVE_TESTS,$(ALL_MODULES.$(m).CLASS)),\
@@ -608,11 +606,47 @@
         $(eval r_r := $(r) $(call get-32-bit-modules,$(r)))\
        )\
      )\
-     $(eval ALL_MODULES.$(m).REQUIRED := $(strip $(r_r)))\
+     $(eval ALL_MODULES.$(m).REQUIRED_FROM_TARGET := $(strip $(r_r)))\
   )\
 )
 endef
-$(call select-bitness-of-required-modules)
+$(call target-select-bitness-of-required-modules)
+
+define host-select-bitness-of-required-modules
+$(foreach m,$(ALL_MODULES),\
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_HOST))\
+  $(if $(r),\
+    $(if $(ALL_MODULES.$(m).FOR_2ND_ARCH),\
+      $(eval r_r := $(call get-host-32-bit-modules-if-we-can,$(r))),\
+      $(if $(filter EXECUTABLES SHARED_LIBRARIES NATIVE_TESTS,$(ALL_MODULES.$(m).CLASS)),\
+        $(eval r_r := $(r)),\
+        $(eval r_r := $(r) $(call get-host-32-bit-modules,$(r)))\
+       )\
+     )\
+     $(eval ALL_MODULES.$(m).REQUIRED_FROM_HOST := $(strip $(r_r)))\
+  )\
+)
+endef
+$(call host-select-bitness-of-required-modules)
+
+define host-cross-select-bitness-of-required-modules
+$(foreach m,$(ALL_MODULES),\
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_HOST_CROSS))\
+  $(if $(r),\
+    $(if $(ALL_MODULES.$(m).FOR_HOST_CROSS),,$(error Only expected REQUIRED_FROM_HOST_CROSS on FOR_HOST_CROSS modules - $(m)))\
+    $(eval r := $(addprefix host_cross_,$(r)))\
+    $(if $(ALL_MODULES.$(m).FOR_2ND_ARCH),\
+      $(eval r_r := $(call get-host-32-bit-modules-if-we-can,$(r))),\
+      $(if $(filter EXECUTABLES SHARED_LIBRARIES NATIVE_TESTS,$(ALL_MODULES.$(m).CLASS)),\
+        $(eval r_r := $(r)),\
+        $(eval r_r := $(r) $(call get-host-32-bit-modules,$(r)))\
+       )\
+     )\
+     $(eval ALL_MODULES.$(m).REQUIRED_FROM_HOST_CROSS := $(strip $(r_r)))\
+  )\
+)
+endef
+$(call host-cross-select-bitness-of-required-modules)
 r_r :=
 
 define add-required-deps
@@ -628,30 +662,42 @@
 endef
 
 # Sets up dependencies such that whenever a host module is installed,
-# any other host modules listed in $(ALL_MODULES.$(m).REQUIRED) will also be installed
+# any other host modules listed in $(ALL_MODULES.$(m).REQUIRED_FROM_HOST) will also be installed
 define add-all-host-to-host-required-modules-deps
 $(foreach m,$(ALL_MODULES), \
-  $(eval r := $(ALL_MODULES.$(m).REQUIRED)) \
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_HOST)) \
   $(if $(r), \
     $(eval r := $(call module-installed-files,$(r))) \
     $(eval h_m := $(filter $(HOST_OUT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
-    $(eval hc_m := $(filter $(HOST_CROSS_OUT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
     $(eval h_r := $(filter $(HOST_OUT)/%, $(r))) \
-    $(eval hc_r := $(filter $(HOST_CROSS_OUT)/%, $(r))) \
     $(eval h_m := $(filter-out $(h_r), $(h_m))) \
-    $(eval hc_m := $(filter-out $(hc_r), $(hc_m))) \
     $(if $(h_m), $(eval $(call add-required-deps, $(h_m),$(h_r)))) \
-    $(if $(hc_m), $(eval $(call add-required-deps, $(hc_m),$(hc_r)))) \
   ) \
 )
 endef
 $(call add-all-host-to-host-required-modules-deps)
 
+# Sets up dependencies such that whenever a host cross module is installed,
+# any other host cross modules listed in $(ALL_MODULES.$(m).REQUIRED_FROM_HOST_CROSS) will also be installed
+define add-all-host-cross-to-host-cross-required-modules-deps
+$(foreach m,$(ALL_MODULES), \
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_HOST_CROSS)) \
+  $(if $(r), \
+    $(eval r := $(call module-installed-files,$(r))) \
+    $(eval hc_m := $(filter $(HOST_CROSS_OUT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
+    $(eval hc_r := $(filter $(HOST_CROSS_OUT)/%, $(r))) \
+    $(eval hc_m := $(filter-out $(hc_r), $(hc_m))) \
+    $(if $(hc_m), $(eval $(call add-required-deps, $(hc_m),$(hc_r)))) \
+  ) \
+)
+endef
+$(call add-all-host-cross-to-host-cross-required-modules-deps)
+
 # Sets up dependencies such that whenever a target module is installed,
-# any other target modules listed in $(ALL_MODULES.$(m).REQUIRED) will also be installed
+# any other target modules listed in $(ALL_MODULES.$(m).REQUIRED_FROM_TARGET) will also be installed
 define add-all-target-to-target-required-modules-deps
 $(foreach m,$(ALL_MODULES), \
-  $(eval r := $(ALL_MODULES.$(m).REQUIRED)) \
+  $(eval r := $(ALL_MODULES.$(m).REQUIRED_FROM_TARGET)) \
   $(if $(r), \
     $(eval r := $(call module-installed-files,$(r))) \
     $(eval t_m := $(filter $(TARGET_OUT_ROOT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
@@ -664,10 +710,10 @@
 $(call add-all-target-to-target-required-modules-deps)
 
 # Sets up dependencies such that whenever a host module is installed,
-# any target modules listed in $(ALL_MODULES.$(m).TARGET_REQUIRED) will also be installed
+# any target modules listed in $(ALL_MODULES.$(m).TARGET_REQUIRED_FROM_HOST) will also be installed
 define add-all-host-to-target-required-modules-deps
 $(foreach m,$(ALL_MODULES), \
-  $(eval req_mods := $(ALL_MODULES.$(m).TARGET_REQUIRED))\
+  $(eval req_mods := $(ALL_MODULES.$(m).TARGET_REQUIRED_FROM_HOST))\
   $(if $(req_mods), \
     $(eval req_files := )\
     $(foreach req_mod,$(req_mods), \
@@ -690,10 +736,10 @@
 $(call add-all-host-to-target-required-modules-deps)
 
 # Sets up dependencies such that whenever a target module is installed,
-# any host modules listed in $(ALL_MODULES.$(m).HOST_REQUIRED) will also be installed
+# any host modules listed in $(ALL_MODULES.$(m).HOST_REQUIRED_FROM_TARGET) will also be installed
 define add-all-target-to-host-required-modules-deps
 $(foreach m,$(ALL_MODULES), \
-  $(eval req_mods := $(ALL_MODULES.$(m).HOST_REQUIRED))\
+  $(eval req_mods := $(ALL_MODULES.$(m).HOST_REQUIRED_FROM_TARGET))\
   $(if $(req_mods), \
     $(eval req_files := )\
     $(foreach req_mod,$(req_mods), \
@@ -723,7 +769,7 @@
 hc_r :=
 
 # Establish the dependencies on the shared libraries.
-# It also adds the shared library module names to ALL_MODULES.$(m).REQUIRED,
+# It also adds the shared library module names to ALL_MODULES.$(m).REQUIRED_FROM_(TARGET|HOST|HOST_CROSS),
 # so they can be expanded to product_MODULES later.
 # $(1): TARGET_ or HOST_ or HOST_CROSS_.
 # $(2): non-empty for 2nd arch.
@@ -743,7 +789,7 @@
     $(eval ALL_MODULES.$(mod).HOST_SHARED_LIBRARIES := $$(ALL_MODULES.$(mod).HOST_SHARED_LIBRARIES) $(deps))\
     $(eval $(call add-required-host-so-deps,$(word 2,$(p)),$(r))),\
     $(eval $(call add-required-deps,$(word 2,$(p)),$(r))))\
-  $(eval ALL_MODULES.$(mod).REQUIRED += $(deps)))
+  $(eval ALL_MODULES.$(mod).REQUIRED_FROM_$(patsubst %_,%,$(1)) += $(deps)))
 endef
 
 # Recursively resolve host shared library dependency for a given module.
@@ -1025,7 +1071,7 @@
 # $(3): The list of overridden modules.
 # Returns empty string (maybe with some whitespaces).
 define expand-required-modules
-$(eval _erm_req := $(foreach m,$(2),$(ALL_MODULES.$(m).REQUIRED))) \
+$(eval _erm_req := $(foreach m,$(2),$(ALL_MODULES.$(m).REQUIRED_FROM_TARGET))) \
 $(eval _erm_new_modules := $(sort $(filter-out $($(1)),$(_erm_req)))) \
 $(eval _erm_new_overrides := $(call module-overrides,$(_erm_new_modules))) \
 $(eval _erm_all_overrides := $(3) $(_erm_new_overrides)) \
@@ -1038,12 +1084,17 @@
 
 # Same as expand-required-modules above, but does not handle module overrides, as
 # we don't intend to support them on the host.
+# $(1): The variable name that holds the initial module name list.
+#       the variable will be modified to hold the expanded results.
+# $(2): The initial module name list.
+# $(3): HOST or HOST_CROSS depending on whether we're expanding host or host cross modules
+# Returns empty string (maybe with some whitespaces).
 define expand-required-host-modules
-$(eval _erm_req := $(foreach m,$(2),$(ALL_MODULES.$(m).REQUIRED))) \
+$(eval _erm_req := $(foreach m,$(2),$(ALL_MODULES.$(m).REQUIRED_FROM_$(3)))) \
 $(eval _erm_new_modules := $(sort $(filter-out $($(1)),$(_erm_req)))) \
 $(eval $(1) += $(_erm_new_modules)) \
 $(if $(_erm_new_modules),\
-  $(call expand-required-host-modules,$(1),$(_erm_new_modules)))
+  $(call expand-required-host-modules,$(1),$(_erm_new_modules),$(3)))
 endef
 
 # Transforms paths relative to PRODUCT_OUT to absolute paths.
@@ -1124,8 +1175,13 @@
   $(eval ### For the rest we add both) \
   $(eval _hif_modules += $(call get-host-32-bit-modules, $(_hif_modules_rest))) \
   $(eval _hif_modules += $(_hif_modules_rest)) \
-  $(call expand-required-host-modules,_hif_modules,$(_hif_modules)) \
-  $(filter $(HOST_OUT_ROOT)/%,$(call module-installed-files, $(_hif_modules)))
+  $(eval ### Split host vs host cross modules) \
+  $(eval _hcif_modules := $(filter host_cross_%,$(_hif_modules))) \
+  $(eval _hif_modules := $(filter-out host_cross_%,$(_hif_modules))) \
+  $(call expand-required-host-modules,_hif_modules,$(_hif_modules),HOST) \
+  $(call expand-required-host-modules,_hcif_modules,$(_hcif_modules),HOST_CROSS) \
+  $(filter $(HOST_OUT)/%,$(call module-installed-files, $(_hif_modules))) \
+  $(filter $(HOST_CROSS_OUT)/%,$(call module-installed-files, $(_hcif_modules)))
 endef
 
 # Fails the build if the given list is non-empty, and prints it entries (stripping PRODUCT_OUT).
@@ -1164,7 +1220,7 @@
     ifneq ($(HOST_OS),darwin)
       _modules := $(PRODUCT_HOST_PACKAGES)
       _nonexistant_modules := $(foreach m,$(_modules),\
-        $(if $(filter FAKE,$(ALL_MODULES.$(m).CLASS))$(filter $(HOST_OUT_ROOT)/%,$(ALL_MODULES.$(m).INSTALLED)),,$(m)))
+        $(if $(ALL_MODULES.$(m).REQUIRED_FROM_HOST)$(filter $(HOST_OUT_ROOT)/%,$(ALL_MODULES.$(m).INSTALLED)),,$(m)))
       $(call maybe-print-list-and-error,$(_nonexistant_modules),\
         $(INTERNAL_PRODUCT) includes non-existant modules in PRODUCT_HOST_PACKAGES)
     endif
diff --git a/core/tasks/tools/package-modules.mk b/core/tasks/tools/package-modules.mk
index 82b4c6a..d7b3010 100644
--- a/core/tasks/tools/package-modules.mk
+++ b/core/tasks/tools/package-modules.mk
@@ -21,8 +21,8 @@
 my_modules_and_deps := $(my_modules)
 $(foreach m,$(my_modules),\
   $(eval _explicitly_required := \
-    $(strip $(ALL_MODULES.$(m).EXPLICITLY_REQUIRED)\
-    $(ALL_MODULES.$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX).EXPLICITLY_REQUIRED)))\
+    $(strip $(ALL_MODULES.$(m).EXPLICITLY_REQUIRED_FROM_TARGET)\
+    $(ALL_MODULES.$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX).EXPLICITLY_REQUIRED_FROM_TARGET)))\
   $(eval my_modules_and_deps += $(_explicitly_required))\
 )
 
diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index 8a4ab94..3856ab9 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -11,7 +11,7 @@
  && rm -rf jdk8.tgz
 
 RUN curl -o /usr/local/bin/repo https://storage.googleapis.com/git-repo-downloads/repo \
- && echo "e147f0392686c40cfd7d5e6f332c6ee74c4eab4d24e2694b3b0a0c037bf51dc5  /usr/local/bin/repo" | sha256sum --strict -c - \
+ && echo "d06f33115aea44e583c8669375b35aad397176a411de3461897444d247b6c220  /usr/local/bin/repo" | sha256sum --strict -c - \
  && chmod a+x /usr/local/bin/repo
 
 RUN groupadd -g $groupid $username \
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index d2f4e25..4136ed4 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -18,10 +18,8 @@
 Builds output_image from the given input_directory, properties_file,
 and writes the image to target_output_directory.
 
-If argument generated_prop_file exists, write additional properties to the file.
-
 Usage:  build_image.py input_directory properties_file output_image \\
-            target_output_directory [generated_prop_file]
+            target_output_directory
 """
 
 from __future__ import print_function
@@ -735,13 +733,8 @@
   return d
 
 
-def SaveGlobalDict(filename, glob_dict):
-  with open(filename, "w") as f:
-    f.writelines(["%s=%s" % (key, value) for (key, value) in glob_dict.items()])
-
-
 def main(argv):
-  if len(argv) < 4 or len(argv) > 5:
+  if len(argv) != 4:
     print(__doc__)
     sys.exit(1)
 
@@ -751,7 +744,6 @@
   glob_dict_file = argv[1]
   out_file = argv[2]
   target_out = argv[3]
-  prop_file_out = argv[4] if len(argv) >= 5 else None
 
   glob_dict = LoadGlobalDict(glob_dict_file)
   if "mount_point" in glob_dict:
@@ -791,10 +783,6 @@
     logger.error("Failed to build %s from %s", out_file, in_dir)
     raise
 
-  if prop_file_out:
-    glob_dict_out = GlobalDictFromImageProp(image_properties, mount_point)
-    SaveGlobalDict(prop_file_out, glob_dict_out)
-
 
 if __name__ == '__main__':
   try:
diff --git a/tools/releasetools/build_super_image.py b/tools/releasetools/build_super_image.py
index 2d596a4..f63453d 100755
--- a/tools/releasetools/build_super_image.py
+++ b/tools/releasetools/build_super_image.py
@@ -58,16 +58,8 @@
 UNZIP_PATTERN = ["IMAGES/*", "META/*"]
 
 
-def GetPartitionSizeFromImage(img):
-  try:
-    simg = sparse_img.SparseImage(img)
-    return simg.blocksize * simg.total_blocks
-  except ValueError:
-    return os.path.getsize(img)
-
-
 def GetArgumentsForImage(partition, group, image=None):
-  image_size = GetPartitionSizeFromImage(image) if image else 0
+  image_size = sparse_img.GetImagePartitionSize(image) if image else 0
 
   cmd = ["--partition",
          "{}:readonly:{}:{}".format(partition, image_size, group)]
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 37f4e38..1b5fb5e 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -168,6 +168,9 @@
   --payload_signer_args <args>
       Specify the arguments needed for payload signer.
 
+  --payload_signer_key_size <key_size>
+      Specify the key size in bytes of the payload signer.
+
   --skip_postinstall
       Skip the postinstall hooks when generating an A/B OTA package (default:
       False). Note that this discards ALL the hooks, including non-optional
@@ -224,6 +227,7 @@
 OPTIONS.log_diff = None
 OPTIONS.payload_signer = None
 OPTIONS.payload_signer_args = []
+OPTIONS.payload_signer_key_size = None
 OPTIONS.extracted_input = None
 OPTIONS.key_passwords = []
 OPTIONS.skip_postinstall = False
@@ -468,9 +472,35 @@
       self.signer = "openssl"
       self.signer_args = ["pkeyutl", "-sign", "-inkey", signing_key,
                           "-pkeyopt", "digest:sha256"]
+      self.key_size = self._GetKeySizeInBytes(signing_key)
     else:
       self.signer = OPTIONS.payload_signer
       self.signer_args = OPTIONS.payload_signer_args
+      if OPTIONS.payload_signer_key_size:
+        self.key_size = int(OPTIONS.payload_signer_key_size)
+        assert self.key_size == 256 or self.key_size == 512, \
+            "Unsupported key size {}".format(OPTIONS.payload_signer_key_size)
+      else:
+        self.key_size = 256
+
+  @staticmethod
+  def _GetKeySizeInBytes(signing_key):
+    modulus_file = common.MakeTempFile(prefix="modulus-")
+    cmd = ["openssl", "rsa", "-inform", "PEM", "-in", signing_key, "-modulus",
+           "-noout", "-out", modulus_file]
+    common.RunAndCheckOutput(cmd, verbose=False)
+
+    with open(modulus_file) as f:
+      modulus_string = f.read()
+    # The modulus string has the format "Modulus=$data", where $data is the
+    # concatenation of hex dump of the modulus.
+    MODULUS_PREFIX = "Modulus="
+    assert modulus_string.startswith(MODULUS_PREFIX)
+    modulus_string = modulus_string[len(MODULUS_PREFIX):]
+    key_size = len(modulus_string) / 2
+    assert key_size == 256 or key_size == 512, \
+        "Unsupported key size {}".format(key_size)
+    return key_size
 
   def Sign(self, in_file):
     """Signs the given input file. Returns the output filename."""
@@ -539,7 +569,7 @@
     metadata_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
     cmd = ["brillo_update_payload", "hash",
            "--unsigned_payload", self.payload_file,
-           "--signature_size", "256",
+           "--signature_size", str(payload_signer.key_size),
            "--metadata_hash_file", metadata_sig_file,
            "--payload_hash_file", payload_sig_file]
     common.RunAndCheckOutput(cmd)
@@ -554,7 +584,7 @@
     cmd = ["brillo_update_payload", "sign",
            "--unsigned_payload", self.payload_file,
            "--payload", signed_payload_file,
-           "--signature_size", "256",
+           "--signature_size", str(payload_signer.key_size),
            "--metadata_signature_file", signed_metadata_sig_file,
            "--payload_signature_file", signed_payload_sig_file]
     common.RunAndCheckOutput(cmd)
@@ -2087,6 +2117,8 @@
       OPTIONS.payload_signer = a
     elif o == "--payload_signer_args":
       OPTIONS.payload_signer_args = shlex.split(a)
+    elif o == "--payload_signer_key_size":
+      OPTIONS.payload_signer_key_size = a
     elif o == "--extracted_input_target_files":
       OPTIONS.extracted_input = a
     elif o == "--skip_postinstall":
@@ -2125,6 +2157,7 @@
                                  "log_diff=",
                                  "payload_signer=",
                                  "payload_signer_args=",
+                                 "payload_signer_key_size=",
                                  "extracted_input_target_files=",
                                  "skip_postinstall",
                                  "retrofit_dynamic_partitions",
diff --git a/tools/releasetools/sparse_img.py b/tools/releasetools/sparse_img.py
old mode 100644
new mode 100755
index 7919ba4..3367896
--- a/tools/releasetools/sparse_img.py
+++ b/tools/releasetools/sparse_img.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+#
 # Copyright (C) 2014 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -12,6 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import print_function
+
+import argparse
 import bisect
 import logging
 import os
@@ -344,3 +349,21 @@
     """Throw away the file map and treat the entire image as
     undifferentiated data."""
     self.file_map = {"__DATA": self.care_map}
+
+
+def GetImagePartitionSize(img):
+  try:
+    simg = SparseImage(img, build_map=False)
+    return simg.blocksize * simg.total_blocks
+  except ValueError:
+    return os.path.getsize(img)
+
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser()
+  parser.add_argument('image')
+  parser.add_argument('--get_partition_size', action='store_true',
+                      help='Return partition size of the image')
+  args = parser.parse_args()
+  if args.get_partition_size:
+    print(GetImagePartitionSize(args.image))
diff --git a/tools/releasetools/test_ota_from_target_files.py b/tools/releasetools/test_ota_from_target_files.py
index c2da907..466fde1 100644
--- a/tools/releasetools/test_ota_from_target_files.py
+++ b/tools/releasetools/test_ota_from_target_files.py
@@ -1182,6 +1182,7 @@
   def test_init(self):
     payload_signer = PayloadSigner()
     self.assertEqual('openssl', payload_signer.signer)
+    self.assertEqual(256, payload_signer.key_size)
 
   def test_init_withPassword(self):
     common.OPTIONS.package_key = os.path.join(
@@ -1195,9 +1196,16 @@
   def test_init_withExternalSigner(self):
     common.OPTIONS.payload_signer = 'abc'
     common.OPTIONS.payload_signer_args = ['arg1', 'arg2']
+    common.OPTIONS.payload_signer_key_size = '512'
     payload_signer = PayloadSigner()
     self.assertEqual('abc', payload_signer.signer)
     self.assertEqual(['arg1', 'arg2'], payload_signer.signer_args)
+    self.assertEqual(512, payload_signer.key_size)
+
+  def test_GetKeySizeInBytes_512Bytes(self):
+    signing_key = os.path.join(self.testdata_dir, 'testkey_RSA4096.key')
+    key_size = PayloadSigner._GetKeySizeInBytes(signing_key)
+    self.assertEqual(512, key_size)
 
   def test_Sign(self):
     payload_signer = PayloadSigner()
diff --git a/tools/releasetools/testdata/testkey_RSA4096.key b/tools/releasetools/testdata/testkey_RSA4096.key
new file mode 100644
index 0000000..07115e1
--- /dev/null
+++ b/tools/releasetools/testdata/testkey_RSA4096.key
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJRAIBADANBgkqhkiG9w0BAQEFAASCCS4wggkqAgEAAoICAQC7y8EH4O8M9aA7
+UhaWLlW5ceQxZi0P7DNOgog/82SIZh1/Vv0S8KCu9LcngK60oIejPU3k9zb0Mpl2
+4OEtupbOq9SV0nyRIp33rs9EJ0zm8keZ2jEfwTubdhE4GumlwkbfYHlMPmpufqOq
+uxKfCOUZk3ZEC5RFDBqVLGrf9m22ITMQwNGj/u/mtAg2UXRGy534eU1evHOFH8tD
+IxXd378m+gRY+bPi6fOkrJgAw6N01NwwsHRxxQsVgp8m1EKpPJ+ARRtP6YYtNsNB
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+L0rBGoJyEopSbtycAkWEHb/YLolfaTRd
+-----END PRIVATE KEY-----